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US3674754A Expired / Lapsed US ⏱️ 0.0 years remaining

Vulcanizable ethylene/propylene copolymers and process for their preparation

Assignee: Covestro International SA
•
Filing: 1970-09-04
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Granted: 1972-07-04
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Expires: 1990-09-04
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Abstract

Abstract There are disclosed new vulcanizable copolymers of ethylene and propylene containing unsaturations resulting from the presence therein of units deriving from the mixture obtained by the catalytic isomerization of vinylnorbornene said copolymers containing ethylene, propylene, ethylidene norbornene and at least one other diene selected from the group consisting of vinyl norbornene and vinyl norbornene and dicyclopentadiene. The copolymers have vulcanization rates comparable to those of ethylene/propylene/ethylidenenorbornene copolymers and yield elastomers having characteristics comparable to those of the vulcanized ethylene/propylene/ethylidenenorbornene copolymers, but are substantially more economical. The new modified ethylene/propylene copolymers are obtained by copolymerizing a mixture of the starting monomers in contact with catalysts prepared from hydrocarbon-soluble vanadium compounds and hydrides or organometallic compounds of beryllium, aluminum, or lithium-aluminum compounds.

Inventors

  • 👤 Nazzareno Cameli
  • 👤 Paolo Longi
  • 👤 Alberto Valvassori

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 17:41
CPC Classifications
C; C08; C08F; C08F210/00; C08F10/00; C08K; C08K3/00; C08K3/02; C08K3/06

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 26 words
A composition of claim 1 containing above 0.4 mol percent unsaturation wherein the molar ratio of ethylidene norbornene to (1) or (2) is 5:1 to 1:5.
Claim 2
Dependent Claim 15 words
A compositIon of claim 2 consisting essentially of ethylene, propylene, ethylidene norbornene and vinyl norbornene.
Claim 3
Dependent Claim 16 words
A composition of claim 2 consisting essentially of ethylene, propylene, ethylidene norbornene, vinyl norbornene and dicyclopentadiene.
Claim 4
Dependent Claim 28 words
A composition of claim 2 wherein the copolymer contains about 30 to 40 mol percent propylene and about 3 to 4 mol percent ethylidene norbornene and other dienes.
Claim 5
Dependent Claim 9 words
A copolymer of claim 1 in a vulcanized state.
Claim 6
Dependent Claim 127 words
A process for the preparation of unsaturated copolymers of ethylene, propylene, ethylidene norbornene and at least one diene selected from the group consisting of (1) vinyl norbornene and (2) vinyl norbornene and at least one of dicyclopentadiene and 4, 7,8,9-tetrahydroindene, comprising polymerizing said ethylene, propylene, ethylidene norbornene and other dienes with a catalyst system obtained by mixing (1) at least one hydride or organometallic compound of barium aluminum or lithium aluminum complex with (2) at least one hydrocarbon-soluble vanadium compound at a temperature between -80* C. and 125* C., said ethylene and propylene in the liquid phase being present in a molar ratio between 1:200 and 1:4, and ethylidene norbornene and said other dienes present in amounts to provide 0.1 to 20 mol percent in the copolymer.
Claim 7
Dependent Claim 54 words
The process of claim 7 wherein (1) of the catalyst system is selected from the group consisting of aluminum trialkyls and alkyl aluminum halides and (2) is selected from the group consisting of vanadium halides, vanadyl oxyhalides, vanadium alcoholates, vanadyl alcoholates, vanadium halogen-alcoholates, vanadyl halogen-alcoholates, vanadium acetylacetonate, vanadyl acetylacetonate, vanadium halogen-acetylacetonate and vanadyl halogen-acetylacetonates.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-04 1976-01-03 1976-07-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-04 1980-01-03 1980-07-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-04 1984-01-03 1984-07-04 $7700.00 Window Closed / Lapsed

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